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12 bolt Mystery Marks

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08-06-2007, 01:44 PM	#1
kahmke69 Registered User Join Date: Mar 2007 Location: hawk point, missouri Posts: 42	12 bolt Mystery Marks I pulled the differential cover off today and saw this. what could have caused this? I was thinking about adding posi so is this a big deal? Attached Images __________________ 1969 Chevy 1/2 ton 4x4 1972 Chevy K20 1953 Chevrolet 6400

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